# Challenger MK vs RelaxifyApp

The clearest difference is review sentiment: RelaxifyApp at 100% against Challenger MK's 0%. Challenger MK's advantage is in-app purchases (none vs 2) and iOS requirement (13.4 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. RelaxifyApp sells 2 in-app purchases, starting at $12.99 per month. Challenger MK asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 22, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Challenger MK | RelaxifyApp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (14 ratings)](https://appshunter.io/ios/app/relaxifyapp/id1573210878/reviews)** |
| Number of ratings | — | **14** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Freemium |
| Size | 19 MB | 95 MB |
| Requires iOS | **13.4** | 26.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Green IT](https://appshunter.io/developer/1500914276) | [Relaxify Ltd.](https://appshunter.io/developer/1573210880) |

## What reviewers say

### Challenger MK

[App page](https://appshunter.io/ios/app/challenger-mk/id1500914277)

This free mobile app rewards you for walking or running. Earn points for every kilometer to get discount codes from local businesses. Join a community focused on positive societal change and track your activities using Apple Health.

**Highlights:** Earn rewards for walking/running, Redeem points for local business discounts, Participate in challenges, Join a positive community, Integrates with Apple Health

**In-app purchases:** none


### RelaxifyApp

[App page](https://appshunter.io/ios/app/relaxifyapp/id1573210878)

This app offers science-based exercises and gamified mental health technologies to improve cognitive, physical, social, and emotional well-being. It helps reduce stress and anxiety through personalized programs, guided sessions, and progress tracking.

**Highlights:** Personalized well-being programs, Guided exercises for focus and emotion, Progress tracking with rewards, Self-assessment surveys, Over 65 exercises, Daily, weekly, and monthly goals

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $12.99 | per month |
| Yearly Subscription | $89.99 | per year |


## Frequently asked questions

### Is Challenger MK free?

Challenger MK is free to download, with no in-app purchases.

### Is RelaxifyApp free?

RelaxifyApp is free to download, with in-app purchases available.

### Do Challenger MK or RelaxifyApp have ads?

Neither Challenger MK nor RelaxifyApp shows ads.

### Which is updated more often, Challenger MK or RelaxifyApp?

Challenger MK ships an update every 2 months, and RelaxifyApp every 2 months. Most recently, Challenger MK was updated on September 22, 2026 and RelaxifyApp on October 12, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*